Re: Grub not working under software RAID

Re: Grub not working under software RAID

[Vladimir 'φ-coder/phcoder' Serbinenko]

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On 01.04.2011 13:53, Stelios A. wrote:
> Hi,
>
> It's been almost 2 months and that was a production server so reverted
> back to grub legacy.
>
>   
Please keep the list CC'ed. You don't need to do a complete install to
gather the info in question. Just launch the said commands from compile
directory, adding "./" when necessary.
> Thanks however
>
> 2011/3/31 Vladimir 'φ-coder/phcoder' Serbinenko <phcoder@gmail.com>:
>   
>> On 08.02.2011 07:48, Stelios A. wrote:
>>     
>>> Hi all,
>>>
>>> I performed an upgrade from Lenny to Squeeze and didn't manage to
>>> install successfully the grub boot loader.
>>> See below the errors.
>>>
>>> ##################
>>> backup:/tmp# grub-install /dev/md0
>>> /usr/sbin/grub-probe: error: no such disk.
>>> Auto-detection of a filesystem of /dev/md0 failed.
>>> Please report this together with the output of "/usr/sbin/grub-probe
>>> --device-map="/boot/grub/device.map" --target=fs -v /boot/grub" to
>>> <bug-grub@gnu.org>
>>>
>>> ###################
>>> backup:/tmp# /usr/sbin/grub-probe --device-map="/boot/grub/device.map"
>>> --target=fs -v /boot/grub
>>> /usr/sbin/grub-probe: info: changing current directory to /dev.
>>> /usr/sbin/grub-probe: info: changing current directory to net.
>>> /usr/sbin/grub-probe: info: changing current directory to shm.
>>> /usr/sbin/grub-probe: info: changing current directory to pts.
>>> /usr/sbin/grub-probe: info: opening md0.
>>> /usr/sbin/grub-probe: error: no such disk.
>>>
>>>
>>>       
>> Could you supply the output of following commands:
>> cat /proc/mdstat
>> grub-fstest -d all -c `ls /dev/sd?|wc -l` /dev/sd? ls -- -l
>>
>> as well as first and last 128K of every array member?
>>
>>     
>>> _______________________________________________
>>> Bug-grub mailing list
>>> Bug-grub@gnu.org
>>> http://lists.gnu.org/mailman/listinfo/bug-grub
>>>
>>>
>>>       
>>
>> --
>> Regards
>> Vladimir 'φ-coder/phcoder' Serbinenko
>>
>>
>>
>>     
>
>
>   


-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko



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Re: Grub not working under software RAID

[Vladimir 'φ-coder/phcoder' Serbinenko]

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On 01.04.2011 16:43, Sean Porth wrote:
>
>
> On 03/31/11 15:21, Vladimir 'Æ-coder/phcoder' Serbinenko wrote:
> > On 09.02.2011 20:33, Sean Porth wrote:
> >> I have the same exact issue.  Upgrading to Debian squeeze.  I even
> upgraded the grub2 package to the Debian unstable version (1.99~rc1-2)
> and same error.
> >>
> >> backup:/etc# grub-install /dev/md0
> >> /usr/sbin/grub-probe: error: no such disk.
> >> Auto-detection of a filesystem of /dev/md0 failed.
> >> Please report this together with the output of
> "/usr/sbin/grub-probe --device-map="/boot/grub/device.map" --target=fs
> -v /boot/grub" to <bug-grub@gnu.org>
> >>
> >> backup:/etc# /usr/sbin/grub-probe
> --device-map="/boot/grub/device.map" --target=fs -v /boot/grub
> >> /usr/sbin/grub-probe: info: changing current directory to /dev.
> >> /usr/sbin/grub-probe: info: changing current directory to disk.
> >> /usr/sbin/grub-probe: info: changing current directory to by-uuid.
> >> /usr/sbin/grub-probe: info: changing current directory to by-id.
> >> /usr/sbin/grub-probe: info: changing current directory to block.
> >> /usr/sbin/grub-probe: info: opening md0.
> >> /usr/sbin/grub-probe: error: no such disk.
> >>
> >>   
> > Could you supply the output of following commands:
> > cat /proc/mdstat
> > grub-fstest -d all -c `ls /dev/sd?|wc -l` /dev/sd? ls -- -l
> > as well as first and last 128K of every array member?
>
> backup:~# cat /proc/mdstat
> Personalities : [linear] [raid1]
> md1 : active raid1 sdb3[1] sda3[0]
>       945513536 blocks [2/2] [UU]
>
> md0 : active raid1 sdb1[1] sda1[0]
>       29294400 blocks [2/2] [UU]
>
> unused devices: <none>
>
> --
>
> backup:/usr/src/grub-1.98# ./grub-fstest -d all -c `ls /dev/sd?|wc -l`
> /dev/sd? ls -- -l
> ls: cannot access /dev/sd?: No such file or directory
> Invalid disk count.
> Try `./grub-fstest --help' for more information.
>
>
> I think the grub-fstest is showing the crux of the problem.  After the
> upgrade to squeeze I no longer have /dev/sda and /dev/sdb , all though
> md seems to have no problem finding them.
>
Have you tried executing grub-mkdevicemap? Actually the normal way to
launch grub-fstest is:
./grub-fstest -d all -c N <DEVICES> ls -- -l
Where DEVICES is devices in the md array and N is the number of them.
The part with sd? was just a quick hack to detect this things for error
reporting.
>
> >> _______________________________________________
> >> Bug-grub mailing list
> >> Bug-grub@gnu.org
> >> http://lists.gnu.org/mailman/listinfo/bug-grub
> >>
> >>   
>
>
>

-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko



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Re: Grub not working under software RAID

[Vladimir 'φ-coder/phcoder' Serbinenko]

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On 01.04.2011 16:59, Sean Porth wrote:
> backup:~# cat /proc/mdstat
> >> Personalities : [linear] [raid1]
> >> md1 : active raid1 sdb3[1] sda3[0]
> >>       945513536 blocks [2/2] [UU]
> >>
> >> md0 : active raid1 sdb1[1] sda1[0]
> >>       29294400 blocks [2/2] [UU]
>   
How do you access those disks? Do you have /dev/sd[ab][13]. Is it some
kind of VM? If none of /dev/sd[ab][13] /dev/sd[ab] exist it probably
means that there is a bug in udev. Mdraid detection is probably done in
kernel and so presence of nodes under /dev is irrelevant. But any action
attempted with devices from userspace is obviously bound to fail.

-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko



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